- Given Name: 정찬성, Jung Chan Sung
- Pro MMA Record: 14-5-0 (Win-Loss-Draw)
- Nickname: The Korean Zombie
- Current Streak: 1 Loss
- Age: 32 | Date of Birth: 1987.03.17
- Last Fight: November 10, 2018 in UFC
- Weight Class: Featherweight | Last Weigh-In: 146.0 lbs
- Affiliation: Korean Zombie MMA
- Height: 5'7" (171cm) | Reach: 72.0" (183cm)
- Career Disclosed Earnings: $424,000 USD
- Born: Seoul, South Korea
- Fighting out of: Pohang, South Korea
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Chan Sung Jung made his professional MMA debut in 2007 and reeled off nine straight victories while competing for Pancrase, Deep, and Sengoku. Along the way, he received the nickname “The Korean Zombie” for continually pushing the pace in his fights, even after taking significant damage.
Jung made his U.S. debut when he took on Leonard Garcia on Spike TV during WEC 48. The ensuing battle, loaded with extraordinary, wild punching exchanges, would become known as one of the greatest fights of the past ten years. Although Jung lost a contentious Split Decision after three rounds, his stock rose considerably among fans worldwide, and Dana White was seen proudly sporting a “Korean Zombie” t-shirt at the following UFC weigh-ins.
Jung's stock took considerable damage, however, following his sophomore effort with the WEC promotion against George Roop. Jung's wade-in-head-first "Zombie" strategy ended calamitously when Roop flattened Jung with a head kick in the second round. The highlight reel knockout earned Roop a Knockout of the Night award from the WEC. In March, 2011, Jung became the first fighter in UFC history to submit his opponent with the twister technique lauded by Eddie Bravo. The submission win came in a rematch against Garcia.
He would follow up with an impressive 7 second knockout of Mark Hominick for the Knockout of the Night at UFC 140. His next test came against quickly rising newcomer Dustin Poirier in the Main Event of UFC on Fuel TV 3. Jung would earn himself Fight of the Night and Submission of the Night by finishing Poirier in the fourth round. The Korean Zombie would look to keep his undefeated UFC streak alive when he was scheduled to face Ricardo Lamas at UFC 162 with the winner most likely being the #1 contender.